straight pipes will sound ok but not good, if you just want loud its good but daily driving wont be fun. if you get a cat back you will be better off. i have an edelbrock sdt (saleen edition) cat back and it is nice, loud when you want and fair when you want (cops) i only paid like $180 on ebay (new)

my 04 5.4 is straight piped, sounds fantastic, i turn off the stereo just to hear her pull the hill, or echo in between buildings or off barracades...but if i let off the throttle, hardly audible, never even had a cop give a warning for noise, had it done 6 yrs ago...

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